Platform support for suspended scaffolds



Feb. 7, 1928.

Filed. April 6, 192'? RrM H n0 m we m VW T m A a e m Tm 7 .in 4

Patented Feb. 7, 1928.

UNITED STATES THEODORE CORBETT,

OF NEW YORK, N. Y.

PLATFORM SUPPORT FOR SUSPENDED SCAFFOLDS.

Application filed April 6,

This invention relates to platform supports and has for an object to provide an improved construction to be used especially for suspended scaffolds, whereby a more uniform support is presented.

Another object is to provide an improved support wherein the stringers are articulated in such a manner as to permit ready adjustment.

A still further object is to provide a plat form support wherein the supporting members are pivotally secured together so that the strain will be transferred from one point to another in case of breakage of any of the suspending cables.

An additional object is to provide a support which may be easily dismantled but when in use, be capable of being supported by cables of any kind or by supporting machines now in common use.

In the accompanying drawing- Figure 1 is a plan view of a platform support disclosing an embodiment of the invention.

Figure 2 is a longitudinal sectional View through Figure 1, on line 2-2.

Figure 3 is a sectional view through Figure 1 on line 33.

Figure 4 is a transverse sectional view" 30 through Figure 1 on line 4-4.

Referring to the accompanying drawings by numerals, 1 and 2 indicate side bars or stringers. Each of these stringers is made from two angle bars 3 and 4. Adjacent the overlapping portion of bars 3 and 4, each bar is providfil with a plurality of aperturcs 5 for receiving the various bolts 6, whereby the effective length of the stringers 1 and 2 may be varied by varying the amount of overlap. A central supportmg bar 7 is provided for each pair of side bars 1 and 2. The supportin bars 7 are telescopically fitted together in t e same way as the stringers or side bars 1 and 2 and in addition, are connected to the standard putlogs adjacent each end by suitable pins orbolts 8 and 9. The supporting bars 7 are preferably made from angle bars and are arranged with one flange extending downwardly so that the platform boards 10 may rest on a comparatively broad and smooth surface. The stringers 1 and 2 are arranged with their flanges extending upwardly so as to present abutments against which the ends of boards 10 fit, as shown in Figure 1, whereby no 1927. Serial in). 181,492.

longitudinal movements of the boards ca take place.

As indicated in Figure 3, the depending flange of the supporting bar 7 is cut away at each end so that the remaining part may fit flatwise against the upper surface of the putlogs 11 and 12 and so locate the upper surface of the bar 7 whereby it will besubstantially in the same horizontal plane as the horizontal flanges of the stringers 1 and 2, thus giving a proper support at three points to the respective boards 10. Each of the stringers at each end has the horizontal flange bent downwardly to form lugs 13 and 14 for receiving suitable bolts for connecting the lugs to the putlogs 11 and 12. The bending downwardly of the horizontal flanges results in the vertical flanges extending beyond the horizontal flanges for presenting hinge members or apertured cars 15 and 16. The ear 15 of one stringer overlaps the car 16 of the next ad'acent stringer and suitable bolts 17 act as plntles for plvotally connecting the ears together. In this way, each set of stringers 1 and 2 and associated parts, form a section and the respective sections are pivotally connected together by the respective bolts 17. The resulting structure is a continuous platform support which may be easily raised and lowered in the usual way and may be easily set up or disassembled. By means of this structure, a continuous safety chain or support is supplied, run ning from one supporting machine to the other, whereby the failure of any one machine (cable and its hoist) would not be serious as its load would then be transferred to the adjacent machines. By making the stringers 1 and 2 extensible, any desired spacing of the machines is permitted.

The stringers 1 and 2 and associated parts, have been shown as metal, but if desired, they could be made of wood without depart ing from the invention. It will be noted that the'boards 10 are short light boards and that they are placed on top of the stringers so as to run at right angles to the building to form the workmans platform or to form an overhead protecting shed. This effects a considerable economy in the amount of lumber used, as the boards 10 are not as thick as the planks heretofore used, and also, there is no overlapping. Where a safety or protecting shed is desired, suitable uprights are connected to the stringers 1 and 2 or some other part of the respective sections, shaped in cross section with a bent down and then stringers l and 2 and associated section of the horizontal flange of each parts mounted on the supports. stringer at each end, means for securing said 10 What I claim is: p bent down sections to said putlogs, and 5 The combination with a suspended scafboards positioned on said stringers extendfolding, having putlogs, of a platform suping transversely of the stringers. port formed with a, pair of stringers L- THEODORE CORBETT. 

